Difference: AMC13UserManual (41 vs. 42)

Revision 4221 Jun 2018 - EricHazen

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META TOPICPARENT	name="HcalDTC"

THIS MANUAL IS INCOMPLETE but what is written here should be more accurate and up to date than the old "functional specification". Please e-mail me if you find mistakes/omissions here (Eric H).

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`CONF.LTRIG.AMCxx.BITy.TRIGGER_MASK`	Set 8-bit mask for AMC number xx (01-11) trigger bit y (0-7)
`CONF.LTRIG.BITy.TRIGGER_THRESHOLD`	Set 4-bit threshold (0-12) for trigger bit y (0-7)

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External Clock / Trigger Inputs

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Clock / Trigger Inputs

The AMC13 external trigger can come from one of 3 sources (optical fiber, internal or external copper signal). The AMC operating clock can only come from the fiber input, though this can be provided in a self-contained way using a loop-back fiber .

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> wv CONF.TTC.ENABLE_INTERNAL_L1A 1 > wv CONF.TTC.T3_TRIG 1

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Resetting the PLL

The PLL which recovers the clock on the TTC input may lose lock if e.g. the TTC clock is interrupted for some reason. This PLL may be reset using the following command in '''AMC13Tool2''':

  > wv 0x0 0x8

Currently there is no address table entry nor dedicated command to accomplish this. Also, I am fairly certain that this reset is performed only at power-up and not as part of any software initialization sequence in the AMC13 or HCAL software!

-- Eric Hazen - 21 Jun 2018

HCAL Orbit Gap Calibration

The AMC13 implements several features to facilitate triggers for calibration purposes during the LHC "Orbit Gap" during which no normal L1A should occur. The details of this have to a certain extent been lost in time.

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